<!DOCTYPE html>
<html>
<head>
    <title>Testing the new font-style values introduced in CSS Fonts level 4</title>
    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-style-prop" />
    <script src="../../../resources/testharness.js"></script>
    <script src="../../../resources/testharnessreport.js"></script>
</head>
<body>
    <div id="test"></div>
    <script>
        var testFontStyle = [
            { style: "italic",                      expectedResult: true,   message: "'italic' is valid" },
            { style: "italic 20deg",                expectedResult: false,  message: "'italic' followed by angle is invalid" },
            { style: "italic a",                    expectedResult: false,  message: "'italic' followed by non-number is invalid" },
            { style: "oblique",                     expectedResult: true,   message: "'oblique' is valid" },
            { style: "oblique 0deg",                expectedResult: true,   message: "'oblique' followed by zero degrees is valid",                 expectedValue: "normal" },
            { style: "oblique 20deg",               expectedResult: true,   message: "'oblique' followed by positive angle in degrees is valid" },
            { style: "oblique 0.5rad",              expectedResult: true,   message: "'oblique' followed by positive angle in radians is valid",    expectedValue: /^oblique 28\.\d*deg$/ },
            { style: "oblique 20grad",              expectedResult: true,   message: "'oblique' followed by positive angle in gradians is valid",   expectedValue: "oblique 18deg" },
            { style: "oblique 0.1turn",             expectedResult: true,   message: "'oblique' followed by positive angle in turns is valid",      expectedValue: "oblique 36deg" },
            { style: "oblique 20px",                expectedResult: false,  message: "'oblique' followed by number with invalid unit type is in valid" },
            { style: "oblique -20deg",              expectedResult: true,   message: "'oblique' followed by negative angle is valid" },
            { style: "oblique 20.5deg",             expectedResult: true,   message: "'oblique' followed by fractional angle is valid" },
            { style: "oblique 90deg",               expectedResult: true,   message: "'oblique' followed by maxumum 90 degree angle is valid" },
            { style: "oblique -90deg",              expectedResult: true,   message: "'oblique' followed by minimum -90 degree angle is valid" },
            { style: "oblique 90.01deg",            expectedResult: false,  message: "'oblique' followed by positive out of range angle is in invalid" },
            { style: "oblique -90.01deg",           expectedResult: false,  message: "'oblique' followed by negative out of range angle is in invalid" },
            { style: "oblique 10",                  expectedResult: false,  message: "'oblique' followed by unit-less value is invalid" },
            { style: "oblique 30deg",               expectedResult: true,   message: "'oblique' followed by positive angle is valid" },
            { style: "oblique a",                   expectedResult: false,  message: "'oblique' followed by non-number is invalid" },
            { style: "oblique 20deg a",             expectedResult: false,  message: "'oblique' and angle followed by non-number is invalid" },
            { style: "oblique -",                   expectedResult: false,  message: "'oblique' followed by isolated minus is invalid" },
            { style: "oblique - 20deg",             expectedResult: false,  message: "'oblique' followed by minus and angle separated by space is invalid" },
            { style: "oblique -a",                  expectedResult: false,  message: "'oblique' followed by minus and non-number is invalid" },
            { style: "oblique calc(50deg)",         expectedResult: true,   message: "'oblique' followed by calc is valid",                         expectedValue: "oblique 50deg" },
            { style: "oblique calc(-120deg)",       expectedResult: true,   message: "'oblique' followed by calc is valid even if it must be clamped (no computation)",     expectedValue: "oblique -90deg" },
            { style: "oblique calc(6 * 20deg)",     expectedResult: true,   message: "'oblique' followed by calc is valid even if it must be clamped (with computation)",   expectedValue: "oblique 90deg" },
            { style: "oblique calc(10grad + 5deg)", expectedResult: true,   message: "'oblique' followed by calc is valid even if it mixes units (with computation)",       expectedValue: "oblique" }
        ];

        testFontStyle.forEach(function (testCase) {
            test(() => {
                assert_equals(window.CSS.supports("font-style", testCase.style), testCase.expectedResult, "Font-style supports: " + testCase.message);
            }, "Font-style (supports): " + testCase.message);
        });

        testFontStyle.forEach(function (testCase) {
            if (testCase.expectedResult) {
                test(() => {
                    let element = document.getElementById("test");
                    element.style = "font-style: " + testCase.style;
                    let actualValue = getComputedStyle(element).fontStyle;
                    let expectedValue = testCase.expectedValue ?? testCase.style;
                    let assert_fn = expectedValue instanceof RegExp ? assert_regexp_match : assert_equals;
                    assert_fn(actualValue, expectedValue, "Font-style computed style: " + testCase.message);
                }, "Font-style (computed): " + testCase.message);
            }
        });
    </script>
</body>
</html>
